Involvement:Expert (understands the inner workings) - Ownership:more than 1 month
I've had this lil gadget for months now to calibrate my friend and I's scales (bought them from DX as well, http://www.dealextreme.com/details.dx/sku.15002) It weighs exactly what it should. Definitely a must have if you want to weigh accurately with your scale. You always want to keep it calibrated.
Like I've said I've owned it for months. It works and there are no con's.
Buy this if you want to keep your scale accurate. I'm happy with my purchase and will probably have to buy another in the near future for my friend.
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